Processing Machinery
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Random copolymer polypropylene pipe failing pressure test
Problem Phenomenon
The pipe ruptures or leaks in the hydraulic test, and pressure resistance does not meet standards.
Failing the pressure test directly threatens the safety of pipe use and is a fatal defect in water supply and gas pipelines.
Cause Analysis
(1) Pipe wall thickness is insufficient or uneven
(2) Material degradation causes molecular weight reduction
(3) There are bubbles or impurities inside the pipe
(4) Inappropriate crystallinity results in poor mechanical properties
(5) Insufficient melt plasticization results in poor welding
Solution
(1) Check and adjust pipe wall thickness to ensure uniform wall thickness at all parts meets standards
(2) Control extrusion temperature within the 190-260°C range to avoid material degradation
(3) Fully dry the raw material to ensure it is clean
(4) Optimize cooling conditions to ensure appropriate crystallinity of random copolymer polypropylene
(5) Optimize screw design to ensure full plasticization
Key Takeaway
Pressure test failure is caused by insufficient wall thickness, material degradation or internal defects and needs to be systematically solved from process and material quality.
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